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Former Twitter Chief Scientist Abdur Chowdhury is working on a new, super-stealthy project called Pushd. Details are scarce, but here’s what we know: According to an SEC filing, he’s teamed up with Summize co-founder Eric Jensen and the two have raised $1.35 million for the venture, which is based in New York City.

Chowdhury joined Twitter with the company’s 2008 acquisition of search engine Summize. He became Chief Scientist at Twitter, while Jensen became Twitter’s Tech Lead for Search and Relevance.

So what exactly is Pushd? It’s tough to say. The site is nothing but an email sign-up page for beta access to an unspecified service. I’ve tried reaching out to Chowdhury for details, but so far have been unable to get ahold of him. Hopefully he’ll see this and, you know, give some more details about whatever neat stuff the team is building.